![]() The line cage “ControlPolygonToSrf” The final shape The collection included a pair of earrings and a necklace pendant. ![]() Splines 6 The heart shape The heart shape was designed using the same strategy: T-Splines “ControlPolygonToSrf”, and point editing.It is possible to add individual control points instead of an entire row. The original surface Begin point insertion The final shape I chose to use simple T-Splines point insertion, which will disregard the surface geometry and append directly to the control cage. In this case I wanted a thicker base, so I used T-Splines “Insert Point” to insert some points to the main branch. 5 Adding detail The geometry can still be refined by either inserting or removing control points. The final result is a single, smooth and editable polysurface, with 266 control points. The ends were left open so they match when the ring is bent. Splines Preview surfaces are added and deleted by clicking over them and in a few minutes everything is set up.Setting priority to the ground curves fixes most of it at once. The tweaking process is a fun-to-play puzzle, in fact. Some tweaks are usually needed in the “Faces” tab. First, the command tries to figure out the topology. 4 T-Splines surface generation At this point, I entered the T-Splines “ControlPolygonToSrf” command, which is a two-step process. Next, the 2D plan was converted into a 3D cage by copying the plan and adding pillars. The final control polygon had a pair of five-sided areas, and everything else was squares. T-Splines “ControlPolygonToSrf” can work with pretty much any topology, but squares are desirable, so I tried to keep the number of corners as even as possible. ![]() Splines 3 Building the control polygon The first step was simply designing a polyline around the desired shape.Control Polygon Inside the command Final shape Both strategies would have delivered the desired shape, but since I had already laid out the topology, I went with T-Splines “ControlPolygonToSrf.” Notice that I got one control point per line intersection, providing for easy topology planning and easy-to-tweak geometry. Building the shape from polylines, using the T-Splines “ControlPolygonToSrf” command. T-Splines sphere Face selected After face extrusion 2. Modeling in a subdivision surface-like workflow, using T-Splines “Face extrusion”. Model planning in Rhino I considered two approaches: 1. Splines 1 2 Sketching Basic form finding was done by hand sketching and 2D illustration programs, with this final concept: The shape was defined in developed format, to be later bent into the ring model.The tight integration of T-Splines with Rhino made this workflow efficient. Towards the end of the process, I was able to seamlessly use some new features available in Rhino 4 to finish the production. In short, most of the modeling work was done using the T-Splines “ControlPolygonToSrf” command (to quickly generate a surface) and the T-Splines “Insert Point” command (to add local control). The process The following tutorial walks step by step through my modeling process. ![]() The whole modeling process took me six hours. I was able to build a smooth and continuous surface that I could easily edit to cope with aesthetic, design and fabrication issues. The solution: T-Splines I had done production work in the past using T-Splines to make free-form surfaces, and liked how easy it was to edit them, but this was my first time using them in manufacturing. I had modeled a similar ring in the past using my previously described workflow, but rather than renting a seat of Maya to do the redesign, I decided to try to complete the whole project inside Rhino 4 using T-Splines. The project Recently, I needed to create a branch-shaped ring with hearts in place of leaves as a gift to my wife. In the past, I have rented a seat of Maya to design these projects with subdivision surfaces, make all my tweaks to the design while still in Maya, then export a NURBS, bring it to Rhino, and work with the model as a piece of immovable geometry. The problem However, one area I have always struggled with in Rhino is with free-form jewelry designs. Rhino has been the best companion for years. After first using it for 3D rendering work, since 2003 it’s been a key part of my rapid prototyping business, which covers mostly jewelry. and Modellistica PAGE 1 Introduction I have been using Rhino since 1998. Organic Modeling with T-Splines and Rhino® 4 A case study in free-form jewelry design Ricardo Amaral, Modellistica © 2007 by T-Splines, Inc.
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